Rosewood Detention Basin Emergency Action Plan

EMERGENCY ACTION PLAN

ROSEWOOD DETENTION BASIN at BLAKES ROAD, ROSEWOOD

September 2021

This Emergency Action Plan has been prepared to comply with the conditions notified under the Water Supply (Safety and Reliability) Act 2008, Chapter 4.

Emergency Activation Quick Reference

The Emergency Action Plan (EAP) for Rosewood Detention Basin covers four emergency conditions evaluated within this document. Use the following table to select the relevant section of the EAP that deals with the emergency condition. Note that the Dam Operator is responsible for the decision to activate the EAP.

Activation Level Alert Lean Forward Stand-Up Stand-Down Decision Authority Dam Operator Dam Operator Dam Operator & Local Dam Operator Disaster Co-Coordinator Activation trigger for emergency conditions relating to dam hazards Flood Event with No Structural Water level = 77.58 EAP activated at water level Water level = 79.90 mAHD Water level = 77.50 mAHD Issues (Flow Chart A) mAHD (Automatic Flood = 78.50 mAHD (Automatic (Automatic Flood Gauge (Automatic Flood Gauge Gauge Level = 2.98 m) Flood Gauge Level = 3.9 m) Level = 5.3 m) Level = 2.9 m) and falling and rising with no more rain Flood Event with Structural Water level = 77.58 EAP activated at water level Water level = 79.90 mAHD Water level = 77.50 mAHD Issues (Flow Chart B) mAHD (Automatic Flood = 78.50 mAHD (Automatic (Automatic Flood Gauge (Automatic Flood Gauge Gauge Level = 2.98 m) Flood Gauge Level = 3.9 m) Level = 5.3 m) Level = 2.9 m) and falling and rising with no more rain Earthquake Event (Flow Chart C) Earthquake occurs of Rainfall Event Imminent - No safety issue magnitude 4 or greater identified/remaining Terror Event (Flow Chart D) Terror event occurs Rainfall Event Imminent - No safety issue identified/remaining

Rosewood Detention Basin Emergency Action Plan

Distribution Control Page

Controlled Copy: Rosewood Detention Basin - EAP - 2021 - Copy#l (Refer Note below)

Authorisation: Signature :

Date: 10/09/2021 21/09/21

Approved by: Acting General Manager, Infrastructure and Environment Department

Copy# Position* Location

1 Dam Operator Ipswich City Council

2 Dam Managers Ipswich City Council Local Disaster Coordinator/Local Emergency Management Unit, Ipswich City Council, 3 Disaster Management Group TacZ Ipswich Department of Regional Development, Mining and Water 4 Chief Executive/Director Dam Safety (DRDMW), Brisbane

5 SES Local Controller Ipswich City SES unit Ipswich District Disaster Management Springfield Police Complex, Disaster Management 6 Group Support Officer, Springfield

Revisions:

Rev.# Description Revision Revised By Update of 2014 EAP following Basin 25/07/2016 Engeny /ICC 1 Upgrade works Updated with LOMG feedback and 28/9/2016 Engeny /ICC 2 DNRME comments 3 Updated with DEWS comments 25/01/2017 ICC Updated with comments from February 2018 (SMEC) 4 stakeholders 5 Annual Review September 2018 ICC 6 Annual Review September 2019 ICC 7 Annual Review October 2020 ICC 8 Annual Review September 2021 ICC

Note: A complete set of documents in hard copy form shall be held in Infrastructure and Environment Department, Asset Management Section at 1 Nicholas Street Level 7. The electronic copies are held in Council directories and on the USB Drive attached to Controlled Copy No.1).

* Refer to the notification listing for contact details.

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Rosewood Detention Basin Emergency Action Plan

TABLE OF CONTENTS

1 Introduction ...... 6 1.1 Risks and Issues ...... 8 1.2 Technical Data ...... 9 1.3 Monitoring Systems ...... 9 1.4 Maintenance and Inspections ...... 9 1.5 Glossary ...... 11 2 Notification Listing Flow Chart ...... 12 2.1 Notification Flow Chart ...... 12 2.2 Emergency Response Notification and Contact List ...... 15 2.3 Impacted Persons / Property ...... 16 2.4 Road Inundation and Road Closure...... 18 2.5 Evacuation Routes / Evacuation Centre ...... 19 2.6 PAR Preparedness Messaging Plans...... 19 3 Roles and Responsibilities ...... 20 4 Emergency Events and Action List ...... 22 4.1 Potential Emergency Events and Responses ...... 22 4.2 Possible Scenarios Leading to Activation of the EAP ...... 24

LIST OF FIGURES

Figure 2-1 – Rosewood EAP Notification Flow Chart ...... 14 Figure 4-1 – Flow Chart A – Flood Inflow, No Embankment Issues ...... 26 Figure 4-2 – Flow Chart B – Flood Inflow, Embankment Issue Identified ...... 32 Figure 4.3 – Flow Chart C – Earthquake Event ...... 39 Figure 4.4 – Flow Chart D – Terror Event ...... 43

LIST OF TABLES

Table 1-1 – Storm Event Probability versus Storage Level ...... 7 Table 1-2 – Rosewood Detention Basin Technical Data ...... 9 Table 1-3 – Rosewood Detention Basin Maintenance & Inspection Schedule ...... 10 Table 1-4 – Glossary ...... 11 Table 2-1 – Alert Level Definitions ...... 12 Table 2-2 - Notification Contact List...... 15

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Rosewood Detention Basin Emergency Action Plan Table 2-3 – Flood Level Designation ...... 17 Table 2-4 – Road Closures for Different Flood Levels (in priority order) ...... 18 Table 3-1 – Roles and Responsibilities ...... 20 Table 4-1 – Possible Dam Safety Issues ...... 22 Table 4-2 – Flow Chart A – Recommended Actions ...... 27 Table 4-3 - Flow Chart B – Recommended Actions ...... 33 Table 4-4 – Modified Mercalli Scale ...... 38 Table 4-5 – Flow Chart C – Recommended Actions ...... 40 Table 4-6 – Flow Chart D – Recommended Actions ...... 44

LIST OF APPENDICES

Appendix A – Mapping ...... 47 Appendix B – Supporting Information ...... 48

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Rosewood Detention Basin Emergency Action Plan

1 Introduction

This Emergency Action Plan (EAP) is part of a suite of dam safety and management documents provided by Ipswich City Council (ICC). When using this plan, reference is also to be made to the current version of Ipswich City Council Local Disaster Management Plan (LDMP). ICC is the owner of Rosewood Flood Detention Basin and any emergency response in relation to the basin is to be managed and directed as per this EAP. The Rosewood Detention Basin is a flood detention structure located on 2 watercourses immediately upstream of the township of Rosewood. The embankment of the detention basin is accessed via parkland off Roslyn and Matthew Streets, Rosewood. The detention basin was constructed to reduce the impact of flooding on the township of Rosewood and downstream areas, by storing runoff from two tributaries upstream of Rosewood and releasing them at a reduced rate, lowering the probability of inundation of properties and infrastructure. In the case where there is no storm event occurring within the catchment the basin is effectively dry and as such Sunny Day Failure is no considered within this document. The Rosewood Detention Basin was constructed as an earth embankment over 2001 and 2002, with a height of approximately 7 meters and a total length in the order of 420 meters. A spillway located in the embankment towards the left abutment provides the ability to discharge safely when the water level in the basin exceeds capacity. Two concrete pipes beneath the basin embankment, discharge water from the detention basin. The outlets are located near the centre of the embankment and near the left (eastern) abutment. The outlets consist of: • Upstream screens which includes a concrete roof slab • 900 mm diameter concrete pipe with downstream penstock set at 70% closed • 1050 mm diameter concrete pipe with downstream penstock (completely closed). The closure of this outlet is in accordance with the OMM 2021 of Rosewood Detention Basin. • Downstream impact type stilling basins. In 2016 the basin embankment was raised by 0.60 m to provide for additional wave freeboard to meet dam safety requirements. Flow restricting penstocks were placed on the downstream ends of the outlet pipes to restrict outflows and improve the flood mitigation performance of the basin. The outlet conditions now adopted for basin operation are a complete closure of a previously installed 1050mm diameter pipe, and a 70% closure of the 900mm diameter pipe. The outlet conditions are fixed and not intended to be adjusted at any time, except for maintenance and routine operational testing of the penstocks. The water level in the detention basin rises to a level that is dependent on the intensity and duration of the rainfall event that has occurred over the upstream catchment area. The detention basin overflow spillway will be engaged for rainfall events greater than the 1% Annual Exceedance Probability (AEP) flood. The basin is designed to pass the PMP Design Flood safely with adequate freeboard to the embankment crest. Storm water discharges from the basin and downstream catchment inflows are conveyed through the township of Rosewood along a vegetated channel. The channel discharges to Western Creek, a tributary of the Bremer River on the southern side of Rosewood. Rosewood Detention Basin has been assessed to be a referable dam, Category 2 (population at risk exceeding 100) due to the proximity of the township of Rosewood and the population at risk. As the detention basin is located a short distance upstream of the township, there will be minimal time to react and implement actions to safeguard the Rosewood community should a dam failure or overtopping event occur. It is estimated that the nearest residences will be impacted within minutes

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Rosewood Detention Basin Emergency Action Plan of a dam failure or overtopping event occurring. Increased levels of inflow to the detention basin during high intensity storm events, will result in the water level in the basin rising and an increase in the downstream water levels. These water levels are within design expectations as noted in Table 1-1. Table 1-1 – Storm Event Probability versus Storage Level

AEP (%) ARI (Years) Storage Level (m AHD) 63% 1 77.04 39% 2 77.58 20% 5 77.80 10% 10 78.50 5% 20 78.92 2% 50 79.46 1% 100 79.89 SPILLWAY LEVEL 79.90 0.1% 1,000 80.23 0.01% 10,000 80.61 0.001% 100,000 80.94 - PMP-Design Flood 81.73 CREST LEVEL 82.30

To assist with monitoring the rainfall conditions and water level at the Rosewood Detention Basin an automated rain gauge, manual read gauge boards and, in the event that the site is unable to be attended, a BOM Enviromon water level monitoring system have been installed. Under normal operating conditions expected for the majority of time and inflow conditions, the rate of flow entering the detention basin will pass directly through the detention basin’s outlet pipe and will not cause significant rise in water levels in the detention basin. Increased flows and a rise in water level in the downstream flow path can be expected, but will be contained within the downstream banks. Increased levels of inflow to the detention will result in the water level rising and an increase in the downstream water levels. These water levels are within design expectations and the detention basin is operating as intended. Once water levels in the detention basin reach or exceed the basin’s spillway level, increased discharges to the downstream area will occur and an increased level of flood threat to downstream property and infrastructure will develop. Depending on the severity of the flood inflow, it may be necessary to activate this EAP. If, during the period when water is impounded in the detention basin a dam safety issue is identified, such as the development of an issue that could lead to failure of the detention basin embankment, then a dam safety situation exists and immediate activation of this EAP will be required.

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Rosewood Detention Basin Emergency Action Plan

1.1 Risks and Issues The following risks and issues may need to be considered in respect to the operation, use and activation of this EAP: • Storm events leading to water being impounded in the detention basin will be local and the time between the rainfall event and the water entering the detention basin will be less than 1 hour; • Water levels in the detention basin are likely to rise quickly; • Both of the outlet pipes are provided with screens on the upstream end. The screens will be prone to blocking with debris. If the water level in the basin rises above the top of the concrete slab over the outlets, it will not be possible to determine if the outlet screens are blocked other than by observing the downstream discharge rate; • Where possible, dam operators should be mobilised early to view the developing situation at Rosewood Detention Basin. This action may need to be based on predictions of an event developing; • Operators attending site are to be aware that due to flooding and inundation of local roads they may be isolated at the site until such time as the flood levels recede; • Access to the detention basin crest area on the left side of the spillway (as viewed looking downstream) is limited and in the event of a flood and discharge through the spillway this area of the embankment is not likely to be accessible. Monitoring of this area of the embankment will have to be from the right side of the spillway; • Dam failure mechanisms may develop quickly with a high likelihood of Council being unable to undertake any actions to mitigate or reduce the development of the failure in a timely manner; • In the event that dam operators identify an issue that is developing into a breach of the embankment, there are minimal actions that they can take to stop or reduce the failure. The main action of the operators under these circumstances will be to observe the situation at the detention basin and provide warning to the Emergency Services and the Coordinator of the event such that downstream evacuations can be undertaken in a timely manner; • The detention basin embankment has the potential of developing a failure under flood conditions due to: o The embankment only experiencing water levels on the upstream side and testing of the embankment structural integrity infrequently; o Seepage through the embankment will only be evident when there is water stored in the basin. If seepage is identified then it is likely that an open passage exists through the embankment (highly porous area or a piping mechanism is developing); o The embankment fill material will be slowly drying and potentially developing cracks; and o The embankment is homogenous clay fill with no filters. Seepage through the embankment or cracks will be uncontrolled and could therefore develop relatively quickly into a dam failure mechanism.

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Rosewood Detention Basin Emergency Action Plan

1.2 Technical Data Table 1-2 – Rosewood Detention Basin Technical Data

Rosewood Detention Basin POPULATION AT RISK • Sunny Day Failure Not Applicable • Flood PAR > 100 Type of dam Earth fill Embankment – Homogenous Fill Dam Owner Ipswich City Council (ICC) Construction Completed Initial 2001/2002, Upgraded 2016 Watercourse Masons Gully Catchment Area 1.19 km2 Length of Dam Wall 420 m Maximum Height Dam Wall Approximately 7.2 m Spillway Type Broad Crested Weir Full Supply Level (Spillway Level) AHD 79.90 m Dam Crest Level AHD 82.30 m Storage Capacity at F.S.L. 128 ML Annual Exceedance Probability of Discharge through 1% AEP Spillway Peak flow from pipe outlet (900mm diameter 70% closed) 1.7 m3/s

1.3 Monitoring Systems The monitoring systems provided at the Rosewood Detention Basin are flood markers and an automated rainfall and flood gauge. This gauge provides constant monitoring of rainfall events with the data being relayed to the Enviromon monitoring system and is to be used only when conditions make the site difficult to attend. Enviromon is an Australian Government, Bureau of Meteorology product with a capacity to collect and monitor rainfall and river level data in real time. Contact Enviromon for current updates at the Bureau of Meteorology, Phone: Trigger water surface levels given within this document are in both m AHD and the level applicable to the reading on the Enviromon automated instrumentation system. The BOM Enviromon flood gauge zero level (0m) is 74.6 m AHD.

1.4 Maintenance and Inspections To reduce the likelihood of the Rosewood Detention Basin failing under normal operating conditions a program of regular inspection and maintenance needs to be undertaken. This includes the activities listed in Table 1-3:

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Rosewood Detention Basin Emergency Action Plan

Table 1-3 – Rosewood Detention Basin Maintenance & Inspection Schedule

Activity Description / Details Timing / Frequency Dam Safety Regular dam operator inspections throughout the Every 2 months Inspections year. Annual Inspection September / October Special Inspection After a flood event Grass Cutting Cutting the grass on the embankment crest and Three times a year (or more if embankment slopes required) ▪ August/September (prior to annual inspection) ▪ November / December (prior to the wet season) ▪ April/May Outlet Pipes a) Isolate and drain the outlet pipes, Annually (prior to wet season) undertake an inspection of the outlet pipes (inside the pipes). Inspection of the upstream screens and clearing of debris and silt from around the screen. b) Drainage of the downstream impact type dissipater structures, inspection of the structures and removal of any silt or debris. c) Operation (opening and closing) of penstock gates and lubricating as recommended by manufacturer (Hambaker AWE). d) Inspection for evidence of erosion or downstream scouring. Spillway and Inspect shotcrete for signs of loss of coverage and Annually (prior to wet season) Stilling Basin cracking /movement. Inspect rock gabions and mattresses for signs of deformation, movement of rock or damage to the wire baskets Inspect stilling basin for erosion and loss of stone rip rap

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Rosewood Detention Basin Emergency Action Plan

1.5 Glossary Table 1-4 – Glossary

Term Acronym Description

Annual Exceedance Probability AEP Probability of a particular rainfall or flood event being exceeded one or more times in any 12 month period.

Average Recurrence Interval ARI Average interval between exceedances of a particular rainfall or flood event.

Queensland Fire and Emergency QFES Primary provider of fire, search and rescue services to Services the State of Queensland.

Department of Regional DRDMW Department responsible for regulation of dams in Development, Mining and Water Queensland including dam emergencies

Emergency Action Plan EAP Disaster Management Plan providing guidance on the actions required to manage an event associated with Rosewood Detention Basin (this plan)

Ipswich City Council ICC Owner of the referable dam and responsible for the operation and management of Rosewood Detention Basin Local Disaster Coordinator LDC Refer to definition in Disaster Management Act for detailed definition

Local Disaster Coordination Centre LDCC Location from which the event or disaster is managed

Local Disaster Management Group LDMG Refer to definition in Disaster Management Act for detailed definition

Probable Maximum Precipitation PMP DF Flooding that is expected to occur due to a PMP Design Flood event taking place in the catchment

Probable Maximum Precipitation PMP Probable Maximum Precipitation rainfall event (upper limit magnitude rainfall event)

Department of Transport and Main DTMR Department responsible for management of main Roads roads including the Rosewood -Laidley Road

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Rosewood Detention Basin Emergency Action Plan

2 Notification Listing Flow Chart

The following section provides guidance on the level of alert to be adopted and the process for engaging this EAP and its escalation from a normal situation to a dam safety emergency situation. Whilst this EAP provides for a situation to develop in stages, it is to be recognised that under some circumstances the immediate activation of this plan to a ‘Stand-Up’ (Dam Safety Emergency) level may be required.

2.1 Notification Flow Chart In this EAP a 4 stage action plan has been adopted as outlined. Each stage also includes a colour coding which is used to define the level of action outlined in the flow charts and action plans. Water levels given are in both m AHD and between brackets the relative BOM Enviromon reading. Note that the BOM Enviromon flood gauge zero level (0m) is 74.6 m AHD.: Table 2-1 – Alert Level Definitions

Level Description (Select one or more appropriate description) Emergency hazards are developing or have developed that raise the need for closer monitoring of weather conditions that may impact on the Rosewood Detention Basin. Emergency hazards may include: • Development of conditions in the Rosewood Detention Basin catchment that warrants frequent or continuous monitoring of weather forecasts, rainfall or basin water levels; ALERT • Potential for flooding downstream of Rosewood Detention (Dam Safety Alert) Basin; • Detention basin water level >77.58 m AHD (Enviromon: > 2.98 m) (2 year ARI - gauge board); or • Reports or identification of acts of terrorism, sabotage or vandalism that may compromise the structural integrity of the Rosewood Detention Basin. • Reports of strong earthquakes in the region measuring a magnitude of 4 on the Richter Scale, or a V on the Modified Mercalli Scale

Emergency event developing further where Rosewood Detention Basin is filling with water and there is the potential for further water level rises or for dam safety issues to develop or have been observed. Conditions may include: • Observed or monitored rainfall and detention basin inflow event that forecasts the potential for the detention basin to LEAN FORWARD partially fill; (Dam Safety Event) • Possible minor flooding downstream of the detention basin; • Detention basin water level > 78.50 m AHD (Enviromon: > 3.9 m) (10 year ARI - gauge board); • Activation of the Emergency Action Plan (EAP) • Blockage of the outlet pipe or other condition that leads to a faster rate of rise and higher water levels in Rosewood Detention Basin; or • Identification of structural issues that may compromise the

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Rosewood Detention Basin Emergency Action Plan

Level Description (Select one or more appropriate description) structural stability of Rosewood Detention Basin. The embankment is intact but there is the potential for it to fail. At this level contact PAR within the evacuation zone via following means: • Text message (within EA polygon via National Emergency Alert System) • Local radio • Door knocking Emergency event exists or developing where major flooding downstream of Rosewood Detention Basin is expected and/or failure of the detention basin embankment is expected. Conditions

may include: • Detention basin water level > 79.90 m AHD (Enviromon: > 5.3 m) (approaching 100 year ARI - gauge board); • Discharge forecasted or occurring through the overflow spillway; • Major flooding downstream of the detention basin; • Identification of dam safety issues that are likely to develop further and result in a breach developing in the detention basin embankment (irrespective of water level in the STAND-UP detention basin or existing or forecasted inflows); (Dam Safety Emergency • Failure of the detention basin embankment is imminent or has occurred; or • Other situation or issue that compromises the structural integrity of Rosewood Detention Basin and could lead to a failure of the detention basin embankment (irrespective of water level in the detention basin or existing or forecasted inflows). At this level contact PAR within the evacuation zone via following means: • Text message (within EA polygon via National Emergency Alert System) • Local radio • Door knocking Emergency hazard to Rosewood Detention Basin are reducing, and the water level in the detention basin is dropping. Conditions may include:

• Water levels in the detention basin are < 77.50 m AHD (Enviromon: > 2.9 m) and falling STAND-DOWN • Dam inspections have not identified any safety issues or (Dam Safety Threat structural integrity issues; Reducing) • Failure of the detention basin embankment is unlikely or not expected; or • Downstream flooding has reduced and is no longer a threat to the public. • Advise all entities previously notified of the situation.

The following flow chart provides guidance on how a dam safety emergency situation may develop and the escalation of the situation through the various notification stages.

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Rosewood Detention Basin Emergency Action Plan

Figure 2-1 – Rosewood EAP Notification Flow Chart

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Rosewood Detention Basin Emergency Action Plan

2.2 Emergency Response Notification and Contact List The following list provides information on persons/organisations who may need to be contacted or called for assistance as part of activation of the EAP. Table 2-2 - Notification Contact List

SN# Title/Name Phone Business Phone Mobile Ipswich City Council 1 Acting Chief Executive Officer

2 Acting General Manager Infrastructure and Environment (Dam Operator)

3 Acting Manager, Assets Services (Council Officer)

4 Manager, Infrastructure Strategy (Council Officer)

5 Manager, Works and Field Services

(Council Officer)

6 Emergency Management and sustainability Manager (Council Officer) 7 Manager, Communication & Engagement (Council Officer)

Disaster Management Group 1 City of Ipswich LDMG - Local Disaster Coordination Centre/Flood Intelligence Centre Emergency Management Duty Officer 2 City of Ipswich LDMG - Local Disaster

Coordinator and Acting General Manager, IED

3 City of Ipswich LDMG - Deputy Local Disaster Coordinator, Emergency Management and Sustainability Manager 4 City of Ipswich LDMG - Deputy Local Disaster Coordinator & General Manager (Planning Regulatory Services 5 Ipswich District Disaster Management Group (District Disaster Coordinator and Chair)

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Rosewood Detention Basin Emergency Action Plan

SN# Title/Name Phone Business Phone Mobile

6 State Disaster Coordination Centre (SDCC)

7 SES Marburg 132 500 (for public use)

8 SES Rosewood 132 500 (for public use)

9 SES Ipswich 132 500 (for public use)

10 Rosewood Police Station 3437 2670

Department of Natural Resources, Mines and Energy

1 Chief Executive/Director Dam Safety, Department of Regional Development, Manufacturing and Water (RDMW)

Bureau of Meteorology

1 Meteorologist in charge

Other organisations 1 Department of Transport and Main Roads 13 19 40

2 Geoscience Australia 1800 655 739

TABLE LAST UPDATED 16/9/2019

2.3 Impacted Persons / Property The properties potentially impacted by an emergency event at the Rosewood Detention Basin, are identified on the flood inundation maps included in Appendix A. Inundation maps are provided for a range of flood events.

The extent and depth of inundation detailed on the inundation maps is based on modelling of rainfall / storm events and the ground information provided. The maps provide an indication only of the depth and extent of inundation that can be expected. For this EAP, the flood categories listed in Table 2-3 have been used.

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Rosewood Detention Basin Emergency Action Plan

Table 2-3 – Flood Level Designation

Flood Designation Description Minor Flood Level Flooding in Rosewood as a result of rainfall in the catchment up to and including a 10% AEP rainfall event. For definition of the Minor Flood Area evacuation zone, refer to the 10% AEP Flood Inundation Maps. Major Flood Level Flooding in Rosewood as a result of a greater rainfall event than 10% AEP rainfall event and / or a failure of the Rosewood Detention Basin Embankment. For definition of the Major Flood Area evacuation zone, refer to the PMP Flood Inundation Map.

The following issues are to be noted in respect to flooding in Rosewood: 1. Inundation of local roads and streets in Rosewood may commence as a result of more frequent rainfall events than a 10% AEP event. Impacts on property where inundation levels start to exceed 300 mm are likely only after rainfall exceeds a 10% AEP event; 2. Management of road closures for events smaller than a 10% AEP event are to be managed as local flood management issues; 3. When using this EAP, it is to be noted that: a. An issue with floods or an emergency situation with the Rosewood Detention Basin is also likely to be coincident with the development of flooding in the Bremer River; b. Flooding impacts will also result from flows in sub-catchments and along drainage lines entering Rosewood from both the east and west sides of Rosewood, downstream of the Rosewood Detention Basin. c. Releases from the Rosewood Detention Basin during a 10% AEP rainfall event will be through the basin outlet pipe only and are likely to be small compared to the coincident flood inflows downstream of the basin. This EAP does not include a detailed list of occupants of properties in Rosewood that may be impacted. More than 100 properties may be impacted and the short time available leading to the issue of warnings or evacuation of residents makes it improbable that contacting individual residents by phone or using similar resources at the LDCC is able to be completed in time. It is recommended that any warnings or need for evacuation be undertaken using the following arrangements: • National Emergency Alert System using the appropriate polygon(s) for the impact area downstream of the Rosewood detention basin; • Local emergency response personnel making public broadcasts and where necessary door knocking individual residences or places of occupancy. Where possible, warning is to be given of the developing situation that provides residents and property occupants time to prepare and where necessary make their way safely to higher ground. The flood inundation mapping included in the appendices of this EAP is to be used as a guide to which properties may be impacted. Priority is to be given to contacting any occupants of land parcels that are either: • Close to the Rosewood Detention Basin first; and • Those located in close proximity to the existing drainage channel through the township (i.e. Masons Gully).

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Rosewood Detention Basin Emergency Action Plan

2.4 Road Inundation and Road Closure The following table provides guidance on the closure of roads and streets for the different flood level designations. The following lists are based on any street within the township of Rosewood where water has covered the street, irrespective of water depth:

Table 2-4 – Road Closures for Different Flood Levels (in priority order)

Flood Designation Roads / Streets Inundated with Water Rosewood Township: 1. Matthew Street between Walloon Road and Bennett Street 2. Walloon Road east of John Street

3. John Street between Walloon Road and Railway Street 4. Trevlac Street 5. Rosewood Marburg Road (Waight Street) north of Albert Street 6. Dellvene Crescent 7. Creedy Street 8. Ahern Street 9. Just Street 10. Yates Street

11. Kingston Street 12. John Street between Berlin Street and Walloon Road 13. Rosewood Laidley Road (lanefield Road) west of Kingston Minor Flood Level Street (Up to a 10% AEP 14. Cabanda Court Event – refer to inundation 15. Skinner Street map for this event) 16. Cassandra Lane 17. Bernadette Crescent 18. Arthur Street 19. Bennett Street 20. William Street 21. Edward Street 22. Albert Street between William Street and Railway Street 23. Railway Street between John Street and Matthew Street 24. Showgrounds Lane 25. Hospital Road Roads downstream of railway line: 26. School Street 27. Madden Lane 28. Bassells Lane 29. Nielsen Road 30. Rosewood Warrill View Road @ Western Creek Major Flood Level All of the above listed roads plus the following additional (Flood level greater than a streets / 10% AEP event and/or areas: including dam failure – Rosewood Township: refer to 1% AEP and PMP 1. Berlin Street flood inundation map for 2. Albert Street between Rosewood Laidley Road and Railway this event) Street 3. Makepeace Street

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Rosewood Detention Basin Emergency Action Plan

Flood Designation Roads / Streets Inundated with Water Roads downstream of railway line: 4. Mill Street 5. Ipswich Rosewood Road @ main culvert south of Madden Lane 6. Keanes Road 7. O’Shea Street 8. Mill Lane 9. Matthew Street (the whole street)

Flooding of roads beyond the township of Rosewood can also be expected due to wider flood impacts that are likely to occur under the rainfall conditions being experienced at Rosewood. Refer to the ICC Flood Management Plan for responses and actions required for these roads. Flood or dam failure releases from the Rosewood Detention Basin are not expected to result in any flood impacts downstream of the township of Rosewood.

2.5 Evacuation Routes / Evacuation Centre The City of Ipswich evacuation centres will be stablished in accordance with the LDMG’s Evacuation Centre Sub Plan. A suitable location will be selected and established according to this plan, based on the best information available for any specific event. When considering evacuation routes, the following should be considered: • Flooding along the drainage channel extending downstream from the Rosewood Detention Basin may result in inundation of roads and streets in Rosewood making access to the Evacuation Centre difficult; • Conditions leading to flooding in Rosewood are also likely to see similar conditions at Marburg. Any evacuation centre being established should consider the potential need to accommodate residents from both communities; • In order to ensure that the population can safely access the evacuation centre at Rosewood it will be necessary to activate this EAP well in advance of any hazardous weather conditions developing and roads becoming impassable or closed; • The weather conditions may make road conditions hazardous; and • Be aware that the weather conditions leading to activation of this EAP may also result in flooding of the Bremer River and its tributaries. The LDMG has plans and locations of evacuation routes and centres that are for use across all hazards.

2.6 PAR Preparedness Messaging Plans Residents identified as being at risk during an emergency event of the detention basin are to be notified annually that they live within a risk zone. The notification will explain to the resident the nature of the risk and advise that they sign up for the alerts.

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Rosewood Detention Basin Emergency Action Plan

3 Roles and Responsibilities

The following roles and responsibilities have been assigned under this EAP: Table 3-1 – Roles and Responsibilities

Role Responsibility Dam Operator • Coordinating regular inspection and maintenance of the detention basin and associated infrastructure • Determination of the most fit-for purpose communication method and implementation • Attend the site during a flood event (if safe to do so) and undertake an inspection and make observations of the situation • Advise the LDC of the developing issue or the event • Reporting of any observations or dam safety issues • Activation of this Emergency Action Plan (EAP) • Issue media alerts and information • Issue warning and evacuation messages • Continue to monitor and provide updates to the LDC • Identify and arrange for additional resources to attend site if required • Take photographs of any dam safety issues • Advise and update Chief Executive/Director Dam Safety, Department of Regional Development, Mining and Water (DRDMW) as required • Within thirty (30) working days after the end of the event, present an Emergency Event Report (EER) to the Director of Dam Safety, DRDMW if required • Maintain a log of the event, actions taken and all communications • Review and maintain a register of lessons learnt with input from all relevant stakeholders • Develops and implements an education program for relevant entities including the LDMG and regularly exercises the EAP to ensure its effectiveness • Conduct public education of the EAP Dam Manager • Monitor regional and local weather conditions (news broadcasts, Bureau of Meteorology web site and warnings, rainfall and stream gauges, weather forecasts) • Earthquake Monitoring (news broadcasts, Geoscience Australia website) • Identify conditions that may lead to flooding in the Rosewood Detention Basin catchment • Alert the Dam Operator to any weather conditions where water levels in Rosewood Detention Basin can be expected to increase

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Rosewood Detention Basin Emergency Action Plan

Role Responsibility Local Disaster Coordinator • Review the data and information received (LDC) • Advise the LDMG of the developing issue or the event • Alert/Advice the emergency response agencies to a developing situation and the possible need to mobilise and implement emergency actions • Implement the local disaster management plan as required • Coordinate the response and establish a Local Disaster Coordination Centre (LDCC) including provision of resources • Convene the Local Disaster Management Group (LDMG) • Assign resources as required to support the Dam Operator • Assist police and SES to evacuate residents at risk

Local Disaster • Coordination of responses if the event escalates to include a wider Management Group area (LDMG) • Convene the LDMG and manage its functions • Review the data and information received • Establish a Local Disaster Coordination Centre (LDCC) including provision of resources • Coordinate disaster operations including external response agencies • Assign resources as required to support the Dam Operator • Assist Police and SES to evacuate residents at risk • Maintain a log of the event, actions taken and all communications Police • Provision of additional resources from outside of the area if required • First response and initial evacuation • Emergency evacuation

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Rosewood Detention Basin Emergency Action Plan

4 Emergency Events and Action List

Under normal operating conditions where minor or low flows in the catchment upstream of Rosewood Detention Basin are occurring, and there is no water being impounded in the detention basin, there are no dam safety issues or direct threat to the downstream population. As such, Sunny Day Failures are not applicable to this detention basin. Under this EAP the following scenarios / situations are provided as a guide to the possible dam safety events and emergency situations associated with this detention basin. In a flood and dam safety emergency situation, all persons involved in activation, management and implementation of this EAP are to note the following: • The location of the Rosewood Detention Basin being only a short distance upstream of the township results in any changes at the detention basin (such as a development of a dam failure) impacting very quickly (within minutes) on the township of Rosewood; • It will be necessary to be pro-active in the implementation of this EAP. Any actions including the evacuation of the flood inundation area are to be actioned and undertaken well ahead of when the issue actually occurs; • The situations likely to lead to implementation of this EAP are also likely to see intense rainfall conditions elsewhere in the area. This will increase the hazards and risks associated with implementing this plan. Hazards may include dangerous road conditions, reduced visibility, flooding of local roads, downed power lines and trees being blown over; • Resources required to respond to a dam safety event at Rosewood may be limited due to these resources being previously deployed elsewhere in the region as a result of the wet weather event, and the time required to organise and for the resources to travel to site; • The Rosewood Detention Basin has a limited ability only to protect persons and property in the township of Rosewood from flooding and flood impacts. The detention basin provides a buffer that enables time to review the developing situation, activate the EAP and for evacuations to be undertaken; • If a dam safety issue is developing that is likely to lead to failure of the Rosewood Detention Basin embankment, there is a high likelihood that it will develop at a rate which exceeds the capacity of the dam owner to respond and to undertake repairs or mitigate the issue.

4.1 Potential Emergency Events and Responses Possible dam safety issues that could develop at the Rosewood Detention Basin include: Table 4-1 – Possible Dam Safety Issues

Possible Dam Safety Issues Description / Characteristics Emergency Issues Blockage of the active outlet pipe, Complete or partial blockage of the Reduced discharge capacity or malfunction of outlet penstocks active outlet pipe or trash screen at through the active outlet pipe. the pipe inlet. Increased rate of rise of the water level in the detention basin. Potential for discharges through the spillway or the embankment being overtopped. Imminent overtopping of the basin Basin is full and water is Increased flow of water and further embankment discharging through the spillway. downstream inundation.

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Rosewood Detention Basin Emergency Action Plan

Possible Dam Safety Issues Description / Characteristics Emergency Issues

Further rainfall or inflows to the Potential for erosion of the basin likely. embankment to take place and Potential for embankment crest to develop into a breach. be overtopped. Seepage Erosion or piping Identification of seepage in the Potential for the seepage to embankment or at the downstream develop into a piping failure. toe of the embankment. Scour Wave scour on upstream Loss of grass cover and erosion embankment protection. Exposure of the embankment fill material and increased erosion taking place. Scour around spillway or outlet Loss of embankment fill and structures destabilisation of the structure Rapid increase or cloudy Development of a piping mechanism Development of internal appearance of seepage and movement of material out of the embankment erosion and a flow embankment. path through the embankment. Potential for the erosion to rapidly increase and the embankment to fail. Inundation of toe of embankment Saturation of the embankment fill at Potential for instability to develop the toe of the embankment in the embankment slopes, (upstream or downstream) particularly as the downstream water level recedes. Failure of penstock gates Sudden increase in pipe outlet flow Sudden increase in outlet flow Longitudinal cracks in Straight or curved cracks in the Embankment instability leading embankment or crest (cracks embankment crest or the to slip failures developing. Exposure parallel with crest alignment) embankment slopes of the embankment and further development of slips. Transverse cracks in embankment Fissures or cracks in the Transverse cracks create an or crest (cracks running across embankment crest or the open water path through the crest alignment) embankment slopes embankment. Potential for further erosion to develop and lead to development of a breach. Slips, slumps or settlement in the Depressions in the embankment Embankment instability developing embankment or the embankment crest. that could develop further including slopes Depressions or bulges on the a breach of the embankment. embankment slopes Failure of the Outlet Pipes Seepage around the outlet pipes. Erosion around and along the outside of the outlet pipes developing into a piping failure Displacement of the outlet pipes Exposing the inner embankment to water and erosion forces Erosion at and around the High flow velocities and turbulence Development of instability at the discharge end of the outlet pipes eroding the stream bed and sides at downstream end of the outlet the outlet pipe discharge pipes. Turbulence around the end wall structure eroding the downstream Development of backward erosion embankment. mechanism along the outlet pipes

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Rosewood Detention Basin Emergency Action Plan

Possible Dam Safety Issues Description / Characteristics Emergency Issues

Erosion of the spillway shotcrete Loss of shotcrete on the spillway Exposure of the embankment and approach, crest and downstream potential for development of chute. erosion.

Exposure of the spillway Spillway flows exposing the gabions. Loss of spillway crest control gabions or loss of downstream structure leading to increased rip rap Turbulence and high flow velocities discharge rates and possible breach wash rip rap out of spillway stilling of embankment. Erosion of the basin. downstream embankment and development of backward erosion in the area around the spillway

4.2 Possible Scenarios Leading to Activation of the EAP There are a number of different events that may lead to this EAP being activated and requiring a coordinated response. The following responses have been developed noting that this is a flood detention basin that: • Experiences conditions where water is only stored to a significant depth on infrequent occasions and generally for short durations only; and • The dam safety emergency events applicable to a water supply dam are not necessarily applicable in this case (i.e. under ‘Sunny Day’ conditions the basin does not hold any water and there is no likelihood of a dam failure occurring that has an impact on the township of Rosewood). The following events are considered to be the most appropriate for Rosewood Detention Basin.

4.2.1 Event A – Flood Event with No Structural Issues (Escalating to Overtopping) Under this scenario flood inflows into the Rosewood Detention Basin have exceeded the discharge capacity of the basin’s outlet pipes and the water level in the detention basin rises. The detention basin spillway is found to be operating as designed and there is no evidence of any dam safety issues (no development of seepage, piping failures, slips, slumps or cracks or other issues likely to impact on the integrity of the embankment). Under this situation, the detention basin is reducing the flow rate in passing through the township of Rosewood, but it is to be noted that: • Inundation of roads within the township is likely to occur; and • Flooding of roads and properties will take place as water levels increase in the detention basin and basin outflows from the pipes increases. If the water level in the detention basin is predicted to exceed the spillway crest level, there will be an increase in the rate of discharge from the detention basin and increased potential for downstream flooding to develop (Major Flood Levels). Refer to the inundation maps (Appendix A) relating to a 1% AEP event or greater. If the water level in the detention basin is predicted to exceed the basin’s embankment crest level (dam crest), the rate of discharge from the detention basin will increase and the potential for downstream flooding increases. If this occurs, there is a high likelihood of the detention basin

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Rosewood Detention Basin Emergency Action Plan embankment scouring and a breach of the embankment developing (dam safety emergency). Refer to the inundation maps (Appendix A) for a PMP event. Under this scenario, a dam safety emergency could also be triggered by any of the following: • The outlet pipes passing water under the detention basin embankment are found to be blocked, partially blocked or flow is being restricted. This will lead to an increased rate of rise of water level in the detention basin, the potential for the spillway to discharge flows and possibly overtopping of the detention basin embankment; • Vandalism, sabotage or other acts, that compromise the structural integrity or ability for the detention basin to operate as intended at the time of a flood event. The detention basin is therefore unable to operate as intended or its structural stability has been compromised. The likelihood of an act of vandalism or terrorism taking place as a storm inflow event is developing or occurring is considered remote. Figure 4.1 presents an emergency actions flow chart for Event A (Flood Event, with no Structural Issues) and Table 4.2 provides the recommended responses to this situation.

Refer to Flow Chart A (Figure 4-1) and Table 4-2 for the responses to this situation.

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Rosewood Detention Basin Emergency Action Plan

Ipswich City Council Rosewood Detention Basin Flow Chart A (Flood Event with no structural Issues)

Regular Monitoring Dam Manager of Conditions Review (Dam Manager) Conditions

Water Level in Basin No likely to >77.58m AHD (2.98m)?

Yes

Dam Operator to Regular Monitoring of Conditions ALERT attend the site & (Dam Manager) Advise Dam Inspect Embankment Operator and LDC if safe to do so

Water Level in Basin Dam Safety Continue on- Issue No likely to rise >78.50m site No Identified? AHD (3.9m) ? monitoring

Yes Yes

Regular

Monitoring of LEAN FORWARD No Conditions (Dam Manager) Dam Operator to Activate EAP

Flood Inflows and Downstream Levels Water level in Basin likely Receding No to Exceed Spillway Crest? (i.e. basin water level< i.e. >79.90m AHD (5.3m) 77.50 mAHD (2.9m)

Regular Monitoring of Conditions (Dam Manager)

Flood Inflows and No Downstream Levels Receding? (i.e. basin water level < 77.50mAHD (2.9m)

Stand-Down Yes

Figure 4-1 – Flow Chart A – Flood Inflow, No Embankment Issues

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Rosewood Detention Basin Emergency Action Plan

Table 4-2 – Flow Chart A – Recommended Actions

Role Actions Dam Manager • Monitor regional and local weather conditions • Identify conditions that may lead to flooding in the Rosewood Detention Basin catchment • Identify conditions or events likely to result in water levels rising in Rosewood Detention Basin

rising Dam Operator • Monitor the rainfall gauge

levels • Advise the Local Disaster Coordinator of the developing

emergency hazard water • Commence recording of data and information and or maintain a log of all communications • Contact Dam Manager if there are concerns about a potential flood situation developing at Rosewood occurring

Identification (Flow Chart A) Chart (Flow Identification • Increase awareness of, or potential for a flood situation to develop rainfall

Event Event Local Disaster • N/A High Coordinator (LDC) Local Disaster • Through the Local Disaster Coordinator increase Management Group awareness of, or potential for a flood situation to develop (LDMG)

Dam Operator • Continue to monitor the catchment and site m) instrumentation 2.98

• Attend the site if safe to do so • Establish communications with LDC Level: • Record data of the event and maintain a log of all communications Gauge

• Arrange for additional resources to attend site if required

Flood

A) • Undertake an inspection of the embankment and associated infrastructure Chart • Provide updates of site conditions to LDC (Automatic (Flow

• Issue an alert to local residents warning of potential flooding AHD

ALERT m • Advise the CEO of ICC of the developing issue or event • Where possible take actions to address dam safety issues 77.58

> or to reduce the impact or development of a dam safety issue level

• Continue to undertake inspections and observe conditions until situation eases water

• Take photographs of any issues Basin • Maintain a log of all actions taken and communications

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Rosewood Detention Basin Emergency Action Plan

Role Actions

Local Disaster • Review the data and information received Coordinator (LDC) • Advise the LDMG of the developing issue or the event • Alert the emergency response agencies to a developing situation and the possible need to mobilise and implement emergency actions • Maintain a log of all actions taken and communications Local Disaster • Increase awareness of, or potential for a flood situation to Management Group develop (LDMG) • Review the emergency response plan and required actions Ipswich City Council (ICC) • Prepare for closure of local roads in Rosewood Dam Operator • Continue to monitor the site instrumentation • Activate the Emergency Action Plan (EAP) • Provide regular updates to LDC • If possible undertake repairs or actions to mitigate or

reduce a dam safety issue m) • Issue media alerts and information 3.9 • Issue a warning notice to residents (PAR) via the National Emergency Alert System Level:

• Advise the CEO of ICC of the developing issue or event

Gauge

• Take photographs of any issues A)

• Advise the Director Dam Safety, DRDMW of the developing Flood

Chart • Update Queensland Rail on the need to close operations on the rail line (Flow • Continue to undertake inspections and observe conditions (Automatic until situation eases AHD

• Record the date of the event and maintain a log of all FORWARD m - actions taken and communications LEAN 78.50

>

level

Local Disaster • Establish a Local Disaster Coordination Centre (LDCC) Coordinator (LDC) including provision of resources water • Convene the Local Disaster Management Group (LDMG)

Basin • Advise emergency response agencies of the developing situation and forecast conditions and impacts • Assign resources as required to support the Dam Operator • Place evacuation centre(s) as per local disaster management plan • Maintain a log of all actions taken and communications

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Rosewood Detention Basin Emergency Action Plan

Role Actions

Local Disaster • Attend the LDCC and undertake assigned roles and Management Group responsibilities to manage the event (LDMG) • Manage the responses to the event as directed by LDC • Contact the emergency response agencies and provide guidance on the need to close roads and for the evacuation of residents • Prepare the evacuation centre(s) • Commence evacuation of residents in close proximity to the drainage course through Rosewood (minor flood area) as per local disaster management plan • Alert all other residents of the possible need to evacuate at short notice • Maintain a log of all actions taken and communications Queensland Fire and • Coordination of responses if the event escalates to include Emergency Services a wider area (QFES)

Ipswich City Council (ICC) • Prepare for closure of local roads due to flooding

Dam Operator • Continue to inspect the site/monitor the catchment and site instrumentation • Provide regular updates to LDC • Issue media alerts and information m) • Issue an evacuation notice to residents (PAR) and others 5.3 via the National Emergency Alert System • Take photographs of any issues Level: • Update Queensland Rail on the need to close operations on the rail line Gauge • Advise the CEO of ICC of the developing issue or event

A) • Advise the Director Dam Safety, DRDMW of the situation Flood

• Continue to undertake inspections and observe conditions Chart until situation eases • Maintain a log of all actions taken and communications (Flow

(Automatic

UP - AHD

m

STAND Local Disaster • Manage the LDMG and assign resources and 79.90

> Coordinator (LDC) responsibilities as required • Assign resources as required to support the Dam level Operator • Advise QFES of the developing situation water

• Maintain a log of all actions taken and communications Basin Local Disaster • Manage the responses to the event as directed by LDC Management Group • Contact the emergency response agencies and provide (LDMG) guidance on the need to close roads and for the evacuation of residents

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Rosewood Detention Basin Emergency Action Plan

Role Actions • Evacuate all residents located within the major flood zone • Alert all other residents of the possible need to evacuate at short notice • Operate and manage the evacuation centre(s) • Maintain a log of all actions taken and communications Queensland Fire and • Coordination of responses if the event escalates to include Emergency Services a wider area (QFES) • Provision of additional resources from outside of the area if required Dam Operator • Undertake a full inspection of Rosewood Detention Basin • Arrange for special inspection and report of the condition of the detention basin embankment and associated infrastructure • Prepare a report on works or actions to be undertaken to restore the embankment and associated infrastructure m)

2.9 • Arrange for any repair works to be undertaken

• Advise the CEO of ICC of the situation and recovery actions Level: required • Advise LDC/LDMG that event has passed and emergency Gauge response services can stand down • Prepare a report on the event within forty-eight hours (48)

Flood

A)

of becoming aware of the incident or failure to the Director Dam Safety, DRDMW Chart • Prepare an Emergency Event Report (EER) and submit to (Automatic the Director Dam Safety within thirty (30) working days (Flow after the end of the event AHD

m • Advise all entities previously notified of the situation. DOWN - 77.5 • Coordinate and conduct a review of the event the responses STAND below • Review the adequacy of the monitoring systems and their operation drops • Register and address lessons learnt in conjunction with level other relevant stakeholders Local Disaster • Advise LDMG that event has passed and emergency water Coordinator (LDC) response services can stand down

Basin • Stand down the LDMG • Provide input to a review of the event with the Dam Operator Local Disaster • Organise response agencies in respect to restoration of Management Group services to Rosewood and return of residents (LDMG) • Participate in a review of the event and the responses

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Rosewood Detention Basin Emergency Action Plan

4.2.2 Event B – Flood Event with Structural Issues Under this scenario an issue related to the structural integrity of the dam is identified while the following is occurring: • The flood level has risen in the detention basin but has not necessarily reached the level of the spillway; • During this period an inspection of the dam is undertaken and identified a structural deficiency or a report is received that a structural integrity issue has been identified; • From the information available there is a concern that failure of the detention basin embankment is possible / likely or imminent. In the event of a structural issue at the basin, the failure modes could be any of a range of options, including excessive seepage, piping, undermining scour, settlement of the embankment and structures, cracking of structural elements, etc., all having the potential for further deterioration and leading to a dam failure. This would increase the rate of discharge through the detention basin and an increased level of downstream flooding. If structural damage to the dam is identified, the initial action is to register an incident on the dam inspection form. Table 4-1 provides a list of potential indicators of structural damage to the Dam. Structural damage to the dam can be caused in many ways including earthquake, explosion, vandalism, or large objects crashing into the dam or reservoir. Structural damage can be identified through visual inspection on a regular basis in accordance with ANCOLD guidelines. For this scenario, reference should be made to flood inundation mapping for a PMP event + Dam Break (Major Flood Level) in Appendix A. Under this scenario, a dam safety emergency could be triggered by any of the following: • Excessive seepage identified at the downstream toe of the detention basin embankment or from the abutments of the detention basin; • Sand boils developing along the toe of the downstream embankment or in the vicinity of the toe; • Water flowing from cracks or development of ‘piping’ holes in the embankment and the movement of material out of the embankment; • Slips, slumps or movement of material on the embankment; • Development of cracks, horizontal movement or settlement of the detention basin embankment; • Scour and erosion around the downstream end of the outlet pipes that is compromising the integrity of the downstream embankment; • Other stability issue or combination of any of the above that leads to concerns around the stability of the detention basin embankment, its outlets or spillway.

Refer to Flow Chart B (Figure 4.2) and Table 4.3 for the responses to this situation.

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Rosewood Detention Basin Emergency Action Plan

Ipswich City Council Rosewood Detention Basin Flow Chart B (Flood Event with structural Issues)

Regular Monitoring Dam Manager of Conditions Review (Dam Manager) Conditions

Water Level in Basin No likely to >71.58mAHD (2.98m) ?

Yes

Dam Operator to Regular Monitoring Alert attend site & inspect of Conditions Advise Dam embankment if safe (Dam Manager) Operator & LDC to do so

Water Level in Basin Dam Operator No Likely to ≥ 77.58m No Identifies Dam AHD? (2.98m) Safety Issue?

Yes Yes

Regular Monitoring LEAN FORWARD No of Conditions Dam Operator to (Dam Manager) Activate EAP

Flood Inflows and Evacuate Likelihood of Downstream Levels everyone in the No Embankment Failing Receding? minor flood area or Breach Developing? i.e. basin water level (LDMG) <77.50 mAHD (2.9m)

Regular Monitoring of Conditions (Dam Manager)

Stand-Down No Yes

Flood Inflows and Downstream Levels Yes Receding? i.e. basin water level <77.50 mAHD (2.9m)

Figure 4-2 – Flow Chart B – Flood Inflow, Embankment Issue Identified

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Rosewood Detention Basin Emergency Action Plan

Table 4-3 - Flow Chart B – Recommended Actions

Role Actions Dam Manager • Monitor regional and local weather conditions • Identify conditions that may lead to flooding in the Rosewood Detention Basin catchment • Identify conditions or events likely to result in water levels rising in Rosewood Detention Basin

rising Dam Operator • Monitor the rainfall and flood (water level) gauge (BOM, Enviromon) levels • Advise the Local Disaster Coordinator of the developing emergency hazard water • Commence recording of data and information and maintain a or log of all communications • Contact Dam Manager if there are concerns about a potential flood situation developing at Rosewood occurring

Identification (Flow Chart B) Chart (Flow Identification • Increase awareness of, or potential for a flood situation to develop rainfall

Event Event High Local Disaster Coordinator • N/A (LDC) Local Disaster • Through the Local Disaster Coordinator increase awareness Management Group of, or potential for a flood situation to develop (LDMG)

Dam Operator • Continue to monitor the site instrumentation 2.98 • Attend the site if safe to do so • Establish communications with LDC Level: • Record data of the event and maintain a log of all communications Gauge • Arrange for additional resources to attend site if required • Undertake an inspection of the embankment and associated

Flood

B) infrastructure • Provide updates of site conditions to LDC Chart

• Issue an alert to local residents warning of potential flooding m) (Automatic •

(Flow Advise the CEO of ICC of the developing issue or event

AHD

• Where possible take actions to address dam safety issues or m to reduce the impact or development of the dam safety issue ALERT • Continue to undertake inspections and observe conditions 77.58

> until situation eases

• Take photographs of any issues level • Maintain a log of all actions taken and communications water

Basin

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Rosewood Detention Basin Emergency Action Plan

Role Actions

Local Disaster Coordinator • Review the data and information received (LDC) • Advise the LDMG of the developing issue or the event • Alert the emergency response agencies to a developing situation and the possible need to mobilise and implement emergency actions • Maintain a log of all actions taken and communications Local Disaster • Increase awareness of, or potential for a flood situation to Management Group develop (LDMG) • Review the emergency response plan and required actions

Ipswich City Council (ICC) • Prepare for closure of local roads in Rosewood

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Rosewood Detention Basin Emergency Action Plan

Role Actions Dam Operator • Continue to monitor the site instrumentation • Activate the Emergency Action Plan (EAP) • Provide regular updates to the Dam Operator and LDC • If possible undertake repairs or actions to mitigate or reduce the dam safety issue • Issue media alerts and information • Issue a warning / evacuation notice to residents (PAR) via the National Emergency Alert System • Take photographs of any issues and throughout the event • Advise the CEO of ICC of the developing issue or event • Alert Queensland Rail to possible flooding of the rail lines • Advise the Director Dam Safety, DRDMW of the developing situation m)

• Continue to undertake inspections and observe conditions 3.9 until situation eases

Level: • Record data of the event and maintain a log of all

communications

Gauge

B)

Flood

Chart Local Disaster Coordinator • Establish a Local Disaster Coordination Centre (LDCC) (LDC) including provision of resources (Flow • Convene the Local Disaster Management Group (LDMG) (Automatic • Advise emergency response agencies of the developing situation and forecast conditions and impacts AHD

FORWARD m • Assign resources as required to support the Dam Operator -

• Place evacuation centre(s) as per local disaster management LEAN 78.50

plan > • Advise QFES of the developing situation level

• Maintain a log of all actions taken and communications Local Disaster • Attend the LDCC and undertake assigned roles and water Management Group responsibilities to manage the event (LDMG)

Basin • Manage the responses to the event as directed by LDC • Contact the emergency response agencies and provide guidance on the need to close roads and for the evacuation of residents • Prepare the evacuation centre(s) • Commence evacuation of residents in close proximity to the drainage course through Rosewood (minor flood area) as per local disaster management plan • Alert all other residents of the possible need to evacuate at short notice • Maintain a log of all actions taken and communications Queensland Fire and • Coordination of responses if the event escalates to include a Emergency Services wider area (QFES)

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Rosewood Detention Basin Emergency Action Plan

Role Actions

Ipswich City Council • Prepare for closure of local roads due to flooding Dam Operator • Continue to monitor site instrumentation • Provide regular updates of site conditions to LDC • Issue media alerts and information • Issue an evacuation notice to residents and others via the National Emergency Alert System • Advise the CEO of ICC of the developing issue or event • Update Queensland Rail on potential flooding of rail lines

• Advise the Director Dam Safety, DRDMW of the situation • Record data of the event and maintain a log of all communications developing

• Continue to undertake inspections and observe conditions

B) until situation eases breach

or • Take photographs of any issues and throughout the event

Chart • Maintain a log of all actions taken and communications failing

(Flow

UP - Local Disaster Coordinator • Manage the LDMG and assign resources and responsibilities (LDC) as required

STAND • Assign resources as required to support the Dam Operator embankment

of • Advise QFES of the developing situation

• Maintain a log of all actions taken and communications Local Disaster • Manage the responses to the event as directed by LDC

Likelihood Management Group • Contact the emergency response agencies and provide (LDMG) guidance on the need to close roads and for the evacuation of residents • Evacuate all residents located within the major flood zone • Alert all other residents of the possible need to evacuate at short notice • Operate and manage the evacuation centre(s) • Maintain a log of all actions taken and communications

Queensland Fire and • Coordination of responses if the event escalates to include a Emergency Services wider area (QFES) • Provision of additional resources from outside of the area if required

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Rosewood Detention Basin Emergency Action Plan

Role Actions Dam Operator • Undertake a full inspection of Rosewood Detention Basin • Arrange for special inspection and report on the condition of the detention basin embankment and associated infrastructure • Prepare a report on works or actions to be undertaken to

restore the embankment and associated infrastructure m) • Arrange for any repair works to be undertaken 2.9 • Advise the CEO of ICC of the situation and recovery actions required Level: • Advise LDC/LDMG that event has passed and emergency response services can stand down Gauge

• Prepare a report on the event within forty-eight hours (48) of

Flood becoming aware of the incident or failure to the Director Dam

B) Safety, DRDMW

Chart • Prepare an Emergency Event Report (EER) and submit to the

Director Dam Safety within thirty (30) working days after the (Automatic

(Flow

end of the event in conjunction with the LDC AHD • Advise all entities previously notified of the situation. m

DOWN - • Coordinate and conduct a review of the event and the 77.5 responses

STAND • Review the adequacy of the monitoring systems and their below operation drops

• Undertake or organise for an investigation into the cause of the dam safety issue level

• Register and address lessons learnt in conjunction with other relevant stakeholders water

Local Disaster Coordinator • Advise LDMG that event has passed and emergency response Basin (LDC) services can stand down • Stand down the LDMG • Provide input to a review of the event with the Dam Operator Local Disaster • Organise response agencies in respect to restoration of Management Group services to Rosewood and return of residents (LDMG) • Participate in a review of the event and the responses

4.2.3 Event C – Earthquake Event In the event of an earthquake an inspection is to be undertaken to ensure structural integrity of the detention basin is maintained. Table 4.1 provides a list of potential indicators of general structural damage to the dam. The dam is required to be inspected and a report issued if an earthquake is of a high enough magnitude, the magnitude will be reported by Geoscience Australia and can be referenced against the Modified Mercalli (MM) intensity scale, shown in Table 4.4 below. A damage assessment is required when an earthquake is rated at an MM intensity of V which correlates to a magnitude 4.0 event. Refer to Flow Chart C (Figure 4.3) and Table 4.5 for responses to this situation.

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Rosewood Detention Basin Emergency Action Plan

Table 4-4 – Modified Mercalli Scale

Earthquake Magnitude Typical Maximum Modified Mercalli Intensity 1.0-3.0 I 3.0-3.9 II-III 4.0-4.9 IV-V 5.0-5.9 VI-VII 6.0-6.9 VII-IX 7.0 and higher VIII or higher Abbreviated Modified Mercalli Intensity Scale I Not felt except by a very few under especially favourable conditions. II Felt only by a few persons at rest, especially on upper floors of buildings. III Felt quite noticeably by persons indoors, especially on upper floors of buildings. Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibrations similar to the passing of a truck. Duration estimated. IV Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably. V Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop. VI Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight. VII Damage negligible in buildings of good design and construction; slight to moderate in well- built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken. VIII Damage slight in specially designed structures; considerable damage in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned. IX Damage considerable in specially designed structures; well-designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations. X Some well-built wooden structures destroyed; most masonry and frame structures destroyed with foundations. Rails bent. XI Few, if any (masonry) structures remain standing. Bridges destroyed. Rails bent greatly. XII Damage total. Lines of sight and level are distorted. Objects thrown into the air.

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Rosewood Detention Basin Emergency Action Plan

Go to Flow Chart B

Go to Flow Chart B

Figure 4.3 – Flow Chart C – Earthquake Event

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Rosewood Detention Basin Emergency Action Plan

Table 4-5 – Flow Chart C – Recommended Actions

Role Actions

Dam Manager • Monitor Geoscience Australia for Earthquake severity

• Monitor regional and local weather conditions Occurs • Identify conditions that may lead to flooding in the Rosewood Detention Basin catchment • Identify conditions or events likely to result in water levels

Earthquake rising in Rosewood Detention Basin

Dam Operator • Contact the Dam Manager if there are concerns about a potential emergency hazard developing at Rosewood Greater)

(or • Monitor the rainfall gauge

4 Identification (Flow Chart C) Chart (Flow Identification • Advise the Local Disaster Coordinator of the developing emergency hazard Event Event • Commence recording of data and information and maintain

Magnitude a log of all communications

Dam Operator • Continue to monitor the catchment and site instrumentation • Attend the site if safe to do so • Arrange for additional resources to attend site if required • Undertake an inspection of the embankment and associated

infrastructure Likely • Provide updates of site conditions to LDC Chart C) Chart • Where possible take actions to address dam safety issues or Event to reduce the impact or development of the dam safety issue Rainfall

ALERT (Flow (Flow ALERT • Continue to undertake inspections and observe conditions No until situation eases • Take photographs of any issues • Maintain a log of all actions taken and communications

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Rosewood Detention Basin Emergency Action Plan

Role Actions Dam Operator • Undertake a full inspection of Rosewood Detention Basin • Arrange for special inspection and report on the condition of the detention basin embankment and associated infrastructure • Prepare a report on works or actions to be undertaken to restore the embankment and associated infrastructure

• Arrange for any repair works to be undertaken • Review the adequacy of the monitoring systems and their Basin

to operation

• Advise the CEO of ICC of the situation and recovery actions required Damage • Prepare a report on the event within forty-eight hours (48)

DOWN (Flow Chart C) Chart (Flow DOWN of becoming aware of the incident or failure to the Director - Dam Safety, DRDMW Structural • Prepare an Emergency Event Report (EER) and submit to the STAND No Director Dam Safety within thirty (30) working days after the end of the event • Coordinate and conduct a review of the event and the responses • Register and address lessons learnt in conjunction with other relevant stakeholders

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Rosewood Detention Basin Emergency Action Plan

4.2.4 Event D – Terrorist Event A response to terrorist activity is the responsibility of the Queensland Police Service (QPS), as such QPS must be notified on 000. Observations of suspicious behaviour not requiring an emergent response should first be reported to the National Security Hotline on 1800 123 400. It is a whole-of- government commitment to safeguard the community through effective and collaborative arrangements to counter terrorism and its consequences. For more information, refer to the Queensland Counter-Terrorism Strategy 2013-2018. Refer to Figure 4.4 - Flow Chart D and Table 4-6 for responses to this situation.

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Rosewood Detention Basin Emergency Action Plan

Go to Flow Chart B

Go to Flow Chart B

Figure 4.4 – Flow Chart D – Terror Event

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Rosewood Detention Basin Emergency Action Plan

Table 4-6 – Flow Chart D – Recommended Actions

Role Actions Dam Manager • Monitor regional and local weather conditions • Identify conditions that may lead to flooding in the

D)

Rosewood Detention Basin catchment • Identify conditions or events likely to result in water levels

Chart rising in Rosewood Detention Basin Occurs

(Flow Dam Operator • Contact QPS (000)

• Contact Dam Manager if there are concerns about a Event potential emergency hazard developing at Rosewood • Monitor the rainfall gauge Terroir Identification • Advise the Local Disaster Coordinator of the developing emergency hazard Event • Commence recording of data and information and maintain a log of all communications

Dam Operator • Continue to monitor the instrumentation • Attend the site if safe to do so • Undertake an inspection of the embankment and associated infrastructure • Provide regular updates to LDC

• Arrange for additional resources to attend site if required

• Undertake an inspection of the embankment and associated Likely infrastructure Chart D) Chart Event

• Where possible take actions to address dam safety issues or to reduce the impact or development of the dam safety issue Rainfall

ALERT (Flow (Flow ALERT • Continue to undertake inspections and observe conditions No until situation eases • Take photographs of any issues • Record data of the event and maintain a log of all actions taken and communications.

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Rosewood Detention Basin Emergency Action Plan

Role Actions Dam Operator • Undertake a full inspection of Rosewood Detention Basin • Arrange for special inspection and report on the condition of the detention basin embankment and associated infrastructure • Prepare a report on works or actions to be undertaken to restore the embankment and associated infrastructure • Arrange for any repair works to be undertaken

• Review the adequacy of the monitoring systems and their operation Basin

to • Arrange for special inspection and report on the condition of the detention basin embankment and associated infrastructure Damage • Advise the CEO of ICC of the situation and recovery actions DOWN (Flow Chart D) Chart (Flow DOWN

- required • Prepare a report on the event within forty-eight hours (48) Structural of becoming aware of the incident or failure to the Director STAND No Dam Safety, DRDMW • Prepare an Emergency Event Report (EER) and submit to the Director Dam Safety within thirty (30) working days after the end of the event • Coordinate and conduct a review of the event and the responses • Register and address lessons learnt in conjunction with other relevant stakeholders

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Rosewood Detention Basin Emergency Action Plan

APPENDIX A

MAPPING

Area Map Catchment Map Evacuation Route map Inundation Mapping

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Alternative Evacuation Route - Marburg Path: I:\Projects\30031267\004_CADD\Spatial\Products\MXD\30031267_Alt_Evac_Route_A3L_v1.mxd Path:

Time:PM1:05:41 Legend Evacuation Routes

Alternative © OpenStreetMap (and) contributors, CC-BY-SA

COORDINATE SYSTEM GDA 1994 MGA Zone 56 0 60 120 180 240 DRAWING NO. 1007842-001 REVISION A Metres EH11799 18/06/2014 PAGE SIZE A3 SCALE 1:5,000 CREATED BY DATE ±

PROJECT NO. 30031267 PROJECT TITLE Ipswich Referable Dams EAPs SOURCE Microsoft Bing imagery CONSULTANT SMEC Australia

Copyright SMEC Australia Pty Ltd. All Rights Reserved.

LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, PMP DF Event, Map 2 of 2 a number of sources - no warranty is given that the AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 03 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, PMP DF Event with Dam Failure, a number of sources - no warranty is given that the Map 1 of 2 AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 04 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, PMP DF Event with Dam Failure, a number of sources - no warranty is given that the Map 2 of 2 AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 05 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, 1% AEP Event, Map 1 of 2 a number of sources - no warranty is given that the AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 06 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, 1% AEP Event, Map 2 of 2 a number of sources - no warranty is given that the AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 07 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, 1% AEP Event with Dam Failure, a number of sources - no warranty is given that the Map 1 of 2 AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 08 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, 1% AEP Event with Dam Failure, a number of sources - no warranty is given that the Map 2 of 2 AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 09 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, 10% AEP Event, Map 1 of 2 a number of sources - no warranty is given that the AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 10 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com LEGEND

Cadastre Flood Depth (mm) 0 - 300 > 300

CLIENT: CONSULTANT: Rosewood Detenon Basin Upgrade REVISION: 01 © SMEC Australia Pty Ltd 2017. All Rights Reserved PROJECT TITLE: Emergency Acon Plan STATUS: DRAFT Disclaimer: While all reasonable care has been taken PROJECT NO: 30031999 to ensure the informaon contained on this map is PAGE SIZE: A3 up to date and accurate, this map contains data from MAP TITLE: Flood Depths, 10% AEP Event, Map 2 of 2 a number of sources - no warranty is given that the AUTHOR: JG informaon contained on this is free from error or 70 0 70 140 210 280 350 m omission. Any reliance placed on such informaon MAP NO: 11 shall be at the sole risk of the user. Please verify the SOURCES: ESRI IMAGERY accuracy of all informaon prior to using it. This map is not a design document. COORDINATE GDA 94 / MGA ZONE 56 01/12/17 SYSTEM: DATE: File path: W:/Projects/30031999/005_Ops/QGIS/Figures.qgs www.smec.com Rosewood Detention Basin Emergency Action Plan

APPENDIX B

SUPPORTING INFORMATION

The following supporting information and documentation has been included with this EAP:

Document Details

Engineering Details Plans and sections detailing original Rosewood Detention Basin, and the 2016 embankment crest raise upgrade

Spillway Discharge Curve Chart detailing spillway discharge flow rate versus water level

Log Form Form that can be used to record events and actions

Communications Form Form that can be used for sending of information relating this EAP

Water Level Rate of Rise Record Blank sheet for recording storage levels and time of reading. Data is used to develop rate of rise charts Sheet

Blank chart that can be used to plot the water level in the Rosewood Detention Basin versus time (assist in predicting water levels). Charts can Water Level Rate of Rise Chart be used to assess when basin water levels may reach critical levels (spillway crest, embankment crest)

Location of Monitoring An aerial map for the location of Monitoring Instrumentation Instrumentation Map

Monitoring of Inflow Events Monitoring of Inflow Events Flowchart Flowchart

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Rosewood Detention Basin Emergency Action Plan

Rosewood Detention Basin Emergency Action Plan

Rosewood Detention Basin Emergency Action Plan

Rosewood Detention Basin Emergency Action Plan

Rosewood Detention Basin Emergency Action Plan

Rosewood Detention Basin Emergency Action Plan

City of Ipswich ROSEWOOD FLOOD DETENTION BASIN EMERGENCY ACTION PLAN EVENT LOG Log Form

Name ……………………………………………………………… Title / Position …………………………………………………..

EVENT LOG Date Time (24 hr) Observations / Actions Taken / Communications Received / Communications Sent

Sheet No. ………. of ………….

Rosewood Detention Basin Emergency Action Plan

City of Ipswich ROSEWOOD FLOOD DETENTION BASIN EMERGENCY ACTION PLAN COMMUNICATION Communications Form Communication To: Name / Title ………………………………………….. Date …………………………… Time (24 hr)……………….. Phone / Fax Number ………………………………………….. Email Address………………………………………………………….

Communication From: Name / Title …………………………………………. Phone / Fax Number …………………………………………. Email Address………………………………………………………….

Current Rosewood Detention Basin EAP Response Level (Circle Current Level)

ALERT LEAN-FORWARD STAND-UP STAND-DOWN

MESSAGE:

Rosewood Detention Basin Emergency Action Plan

City of Ipswich ROSEWOOD FLOOD DETENTION BASIN EMERGENCY ACTION PLAN Rate of Rise Record Sheet

Name / Title ……………………………………………………………. Date ……………………………….

Critical Water Levels ALERT > 75.58 m AHD LEAN – FORWARD > 77.50 m AHD STAND UP > Spillway Crest Spillway Crest 79.90 m AHD Embankment Crest 82.3 mAHD

Time (24 Hr) Water level Comments (Gauge Board Reading)

Sheet No. ………. of ………….

Rosewood Detention Basin Emergency Action Plan

Rosewood Detention Basin Emergency Action Plan

LOCATION OF MONITORING INSTRUMENTATION (Rosewood Detention Basin)

Rosewood Detention Basin Emergency Action Plan

MONITORING OF INFLOW EVENTS FLOW CHART (Rosewood Detention Basin)